The Inn River rises at an altitude of just under 2,500 m in southeastern Switzerland, in the canton of Graubünden. Over a distance of 80 km, it first flows through a high-mountain valley called the Engadin. Here, not far from the sophisticated spa town of St. Moritz, it crosses two small lakes, Lake Sils and Lake Silvaplana, between which lies the idyllic mountain village of Sils Maria. The philosopher Friedrich Nietzsche spent several summers in this exquisite landscape and was inspired by it to write some of his most important works. Christian Saehrendt set out to search for clues at what is perhaps the most important “pilgrimage site” on the Nietzsche scene.